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Attention please:
Some people report problems with the new version when solving hard sudokus.
We have not been able to detect any problems with the new version. Please help us to identify the problem by sending a comment here containing a Sudoku with which there is a problem with the new version and/or an email address so that we can investigate.

How to use

Enter the numbers for the sudoku you want to check or solve in the grid and click on the appropriate button. You can enter the numbers directly or via the "Load" and "Seed" buttons.

This is what the buttons do:

  • Hint: Get a hint.
  • Show Candidates: Display candidate values for empty cells
  • Hide Candidates: Hides candidate values in empty cells
  • Solve:Solves the Sudoku puzzle completely
  • Solve Cell: Solves a single cell. Click in the cell you want to solve first, then click this button
  • Check: Checks if the Sudoku puzzle is valid and can be solved
  • Check Uniqueness: Checks if the Sudoku has a unique solution
  • Rate Difficulty: Displays a difficulty rating of the Sudoku
  • Print: Opens a new window from which the Sudoku can be printed
  • Clear: Clears the puzzle
  • Save: Generates a file containing the current values in the Sudoku grid for downloading
  • Load: Uploads a saved Sudoku into the grid
  • Random Sudoku: Seeds the grid with a random Sudoku
  • Editing Candidates:
    First display the candidates by clicking on the "Show Candidates" button
    Delete candidate Click on the candidate and it will disappear
    Undelete candidate   Click on the position where the candidate is normally displayed and it will reappear
    Entering a value Double click in the cell and type in the number


    Comments and suggestions to support@sudoku-solutions.com